When I thin behind the edge, I lay the secondary bevel down and grind until the primary bevel is little more than a few hairs wide.
In the past, I would use a 140, 150, 400, 800, 1K, 3k, 4K, 5K, 6K progression.
Tonight, just for grins, I just went with the Ume 1K, a pretty fast cutter, and didn't bother with any of the lower grit stones.
I am not 100% certain, but it sure felt like it was faster then working up the lower grit chain.
The reason for this is that when I work up the lower grit chain, it takes me quite a while to get ALL the scratches of the low grit stones out. Inevitably I'll leave a few and have to go back to get them chewing up time.
If I had to remove a ton of metal I can see the lower grits being worthwhile, but with the new generation of fast cutting 1K stones, tonights session has me seriously questioning where exactly that break point lies.
Always learning something